How to check if predefined selected column is null is laravel

Question

I have this code :

$employee_calendar->attendance = Attendance::leftJoin("attendance_corrections", function ($join) {
                $join->on("attendance_corrections.attendance_id", "=", "attendance.id")
                    ->where("attendance_corrections.status", "!=", "rejected");
            })
            ->select('attendance.*', DB::raw('IF(`time` IS NOT NULL, `time`, attendance_corrections.correct_time) as `correctTime`'))
            ->where("attendance.employee_id", $employee->id)
            ->whereDate("attendance.date", "=", $employee_calendar->date)
            ->orderBy('correctTime', 'asc')
            ->with("requests")
            ->distinct()
            ->get();

I want to check if correctTime is null then dont show this data. I have tried ->whereNotNull('correctTime') it is giving error say column not found.

Answer 1

像这样使用它

->whereNotNull('attendance_corrections.correct_time')

Answer 2

由于它是一个派生列，因此您必须使用 having 子句，原始查询的最佳之处在于您可以使用多种类型的运算符，例如 AND、OR 等，只需将其作为字符串传递即可。

->havingRaw("correctTime IS NOT NULL")